2. New York - New York style pizza

New York-style pies mean thin but still pillowy crusts with a crispy bottom (from a coal- or wood-fired oven), tomato sauce, and mozzarella cheese. They're often enormous and produce slices bigger than your head. The city's history with pizza is well-rooted: America's first pizzeria, Lombardi's, opened on Spring Street in Little Italy way back in 1905.

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3. Chicago - Deep dish

Never before has "pie" been a more appropriate synonym for pizza than in Chi-Town. Here, deep dish has a cult following thanks to gobs upon gobs of cheese, a generous shower of toppings, and a goliath wall of crust.

8. Japan - Okonomiyaki

Okonomiyaki is a cross between a savory pancake and pizza. It's a genius combination whose garnishes vary by region, but you can typically find cabbage, pork, bonito fish flakes, an egg, and okonomiyaki sauce.

10. Poland - Zapiekanka

Street food is a pilar of good eats in Poland and this pizza-sandwich hybrid — a.k.a zapiekanka— is no exception. The hand pie is essentially a baguette that's been covered in cheese, mustard, onion, and mushrooms and then baked. And it's finished with ketchup.

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11. Spain - Coca

This pretty flatbread is called coca and it's traditionally topped with Spanish sausage and an array of vegetables. It tends to have much more oil than its American counterpart, but we're definitely not complaining.